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Reverse Gear (28 Teeth): 43-42934 / 43-824109A1
12 3/4" x 21P
This is the larger "800" series lower unit and is bigger than the "400" series typically paired with the 4cyl engines
3852697 Pivot Screw Thrust Washer
Flywheel: 208-1013A1
GM 3859167 Piston Connecting Rod Set MerCruiser 733-227 2.5L 120hp 4cyl 1964-72 Harmonic Balancer Reverse Gear (28 Teeth): 43-42934Part Numbers (GM MerCruiser OMC Stringer OMC Cobra) Piston (Standard Size, but undersized for anything after 1972)) GM 3859167 (stamped) MerCruiser 736 2278 OMC (GM 3860407) Connecting Rod GM ??? (Likely GM 3788435) MerCruiser 613 2277 OMC (GM 3788435) General Application Compatibility Above all else, it's always a good idea to match the number stamped on your existing pistons! MerCruiser & OMC GM 2. 5L 4cyl 120hp 153CID applications roughly 1964 1972
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